unknown critical section size

[IGotD-]

I'm updating my custom druntime to LDC 1.24.0. Previously I 
mentioned this problem with unknown critical section size where 
the compiler only emitted a warning.

rt/profilegc.d(97): Error: unknown critical section size for the 
selected target

https://forum.dlang.org/post/agupeguvxftrucpjvpho@forum.dlang.org

However, with LDC 1.24.0 this is no longer a warning but an error 
which prevents me from building druntime. What is necessary in 
order to solve this problem?